From: Nicolas Pitre <npitre@baylibre.com>
And to do so we ensure the Unicode screen buffer is initialized when
double-width characters are encountered.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
---
drivers/tty/vt/vt.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 24c6cd2eed78..58fa1b285f22 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -2930,8 +2930,15 @@ static int vc_process_ucs(struct vc_data *vc, int *c, int *tc)
{
u32 prev_c, curr_c = *c;
- if (ucs_is_double_width(curr_c))
+ if (ucs_is_double_width(curr_c)) {
+ /*
+ * The Unicode screen memory is allocated only when
+ * required. This is one such case as we need to remember
+ * which displayed characters are double-width.
+ */
+ vc_uniscr_check(vc);
return 2;
+ }
if (!ucs_is_zero_width(curr_c))
return 1;
--
2.49.0